The Mole and Avogadro’s Constant Flashcards

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What is a mole in chemistry?

A mole is the amount of a substance that contains 6.02 × 10^23 particles, such as atoms, molecules or ions.

Avogadro’s constant is 6.02 × 10^23 particles per mole.

The unit mol measures the amount of a substance in moles.

It is often written as N_A and its unit is per mole, mol^-1.

Atoms, molecules and ions can all be counted in moles.

There are 6.02 × 10^23 particles in 1.0 mol of any substance.

2.0 mol has 2.0 × 6.02 × 10^23 = 1.204 × 10^24 particles.

6.02 × 10^23 atoms is 1.0 mol of carbon atoms.

1.204 × 10^24 ÷ 6.02 × 10^23 = 2.0 mol of water molecules.

Atoms are extremely small and there are huge numbers of them, so chemists use moles to count large numbers of particles in a simple way.

‘Amount of substance’ is how many particles there are, measured in moles (mol).

A mole is an amount (like a dozen), while a molecule is a single particle made of atoms.